diff options
author | Patrick Delaunay <patrick.delaunay@st.com> | 2020-02-12 19:37:38 +0100 |
---|---|---|
committer | Patrick Delaunay <patrick.delaunay@st.com> | 2020-03-24 14:05:35 +0100 |
commit | 7ae22d72781de76b3c23b018a3fccc172e9875de (patch) | |
tree | 44288593d3a084fa1b2a13288f38a6d663a5b6e9 /arch | |
parent | df2d1b8fc472bd0c7ec20d86337d437241d9b013 (diff) | |
download | u-boot-7ae22d72781de76b3c23b018a3fccc172e9875de.zip u-boot-7ae22d72781de76b3c23b018a3fccc172e9875de.tar.gz u-boot-7ae22d72781de76b3c23b018a3fccc172e9875de.tar.bz2 |
arm: stm32mp: bsec: add permanent lock support in bsec driver
Add BSEC lock access (read / write) at 0xC0000000 offset of misc driver.
The write access only available for Trusted boot mode, based on new
SMC STM32_SMC_WRLOCK_OTP.
With the fuse command, the permanent lock status is accessed with
0x10000000 offset (0xC0000000 - 0x8000000 for OTP sense/program
divided by u32 size), for example:
Read lock status of fuse 57 (0x39)
STM32MP> fuse sense 0 0x10000039 1
Sensing bank 0:
Word 0x10000039: 00000000
Set permanent lock of fuse 57 (0x39)
STM32MP> fuse prog 0 0x10000039 1
Sensing bank 0:
Word 0x10000039: 00000000
WARNING: the OTP lock is updated only after reboot
WARING: Programming lock or fuses is an irreversible operation!
This may brick your system.
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/arm/mach-stm32mp/bsec.c | 88 | ||||
-rw-r--r-- | arch/arm/mach-stm32mp/cpu.c | 6 | ||||
-rw-r--r-- | arch/arm/mach-stm32mp/include/mach/stm32.h | 9 | ||||
-rw-r--r-- | arch/arm/mach-stm32mp/include/mach/stm32mp1_smc.h | 1 |
4 files changed, 71 insertions, 33 deletions
diff --git a/arch/arm/mach-stm32mp/bsec.c b/arch/arm/mach-stm32mp/bsec.c index 1d904ca..3b923f0 100644 --- a/arch/arm/mach-stm32mp/bsec.c +++ b/arch/arm/mach-stm32mp/bsec.c @@ -12,8 +12,6 @@ #include <linux/iopoll.h> #define BSEC_OTP_MAX_VALUE 95 - -#ifndef CONFIG_STM32MP1_TRUSTED #define BSEC_TIMEOUT_US 10000 /* BSEC REGISTER OFFSET (base relative) */ @@ -24,9 +22,10 @@ #define BSEC_OTP_LOCK_OFF 0x010 #define BSEC_DISTURBED_OFF 0x01C #define BSEC_ERROR_OFF 0x034 -#define BSEC_SPLOCK_OFF 0x064 /* Program safmem sticky lock */ -#define BSEC_SWLOCK_OFF 0x07C /* write in OTP sticky lock */ -#define BSEC_SRLOCK_OFF 0x094 /* shadowing sticky lock */ +#define BSEC_WRLOCK_OFF 0x04C /* OTP write permananet lock */ +#define BSEC_SPLOCK_OFF 0x064 /* OTP write sticky lock */ +#define BSEC_SWLOCK_OFF 0x07C /* shadow write sticky lock */ +#define BSEC_SRLOCK_OFF 0x094 /* shadow read sticky lock */ #define BSEC_OTP_DATA_OFF 0x200 /* BSEC_CONFIGURATION Register MASK */ @@ -53,12 +52,12 @@ #define BSEC_LOCK_PROGRAM 0x04 /** - * bsec_check_error() - Check status of one otp - * @base: base address of bsec IP + * bsec_lock() - manage lock for each type SR/SP/SW + * @address: address of bsec IP register * @otp: otp number (0 - BSEC_OTP_MAX_VALUE) - * Return: 0 if no error, -EAGAIN or -ENOTSUPP + * Return: true if locked else false */ -static u32 bsec_check_error(u32 base, u32 otp) +static bool bsec_read_lock(u32 address, u32 otp) { u32 bit; u32 bank; @@ -66,21 +65,17 @@ static u32 bsec_check_error(u32 base, u32 otp) bit = 1 << (otp & OTP_LOCK_MASK); bank = ((otp >> OTP_LOCK_BANK_SHIFT) & OTP_LOCK_MASK) * sizeof(u32); - if (readl(base + BSEC_DISTURBED_OFF + bank) & bit) - return -EAGAIN; - else if (readl(base + BSEC_ERROR_OFF + bank) & bit) - return -ENOTSUPP; - - return 0; + return !!(readl(address + bank) & bit); } +#ifndef CONFIG_STM32MP1_TRUSTED /** - * bsec_lock() - manage lock for each type SR/SP/SW - * @address: address of bsec IP register + * bsec_check_error() - Check status of one otp + * @base: base address of bsec IP * @otp: otp number (0 - BSEC_OTP_MAX_VALUE) - * Return: true if locked else false + * Return: 0 if no error, -EAGAIN or -ENOTSUPP */ -static bool bsec_read_lock(u32 address, u32 otp) +static u32 bsec_check_error(u32 base, u32 otp) { u32 bit; u32 bank; @@ -88,7 +83,12 @@ static bool bsec_read_lock(u32 address, u32 otp) bit = 1 << (otp & OTP_LOCK_MASK); bank = ((otp >> OTP_LOCK_BANK_SHIFT) & OTP_LOCK_MASK) * sizeof(u32); - return !!(readl(address + bank) & bit); + if (readl(base + BSEC_DISTURBED_OFF + bank) & bit) + return -EAGAIN; + else if (readl(base + BSEC_ERROR_OFF + bank) & bit) + return -ENOTSUPP; + + return 0; } /** @@ -324,6 +324,16 @@ static int stm32mp_bsec_read_shadow(struct udevice *dev, u32 *val, u32 otp) #endif } +static int stm32mp_bsec_read_lock(struct udevice *dev, u32 *val, u32 otp) +{ + struct stm32mp_bsec_platdata *plat = dev_get_platdata(dev); + + /* return OTP permanent write lock status */ + *val = bsec_read_lock(plat->base + BSEC_WRLOCK_OFF, otp); + + return 0; +} + static int stm32mp_bsec_write_otp(struct udevice *dev, u32 val, u32 otp) { #ifdef CONFIG_STM32MP1_TRUSTED @@ -350,17 +360,36 @@ static int stm32mp_bsec_write_shadow(struct udevice *dev, u32 val, u32 otp) #endif } +static int stm32mp_bsec_write_lock(struct udevice *dev, u32 val, u32 otp) +{ +#ifdef CONFIG_STM32MP1_TRUSTED + if (val == 1) + return stm32_smc_exec(STM32_SMC_BSEC, + STM32_SMC_WRLOCK_OTP, + otp, 0); + if (val == 0) + return 0; /* nothing to do */ + + return -EINVAL; +#else + return -ENOTSUPP; +#endif +} + static int stm32mp_bsec_read(struct udevice *dev, int offset, void *buf, int size) { int ret; int i; - bool shadow = true; + bool shadow = true, lock = false; int nb_otp = size / sizeof(u32); int otp; unsigned int offs = offset; - if (offs >= STM32_BSEC_OTP_OFFSET) { + if (offs >= STM32_BSEC_LOCK_OFFSET) { + offs -= STM32_BSEC_LOCK_OFFSET; + lock = true; + } else if (offs >= STM32_BSEC_OTP_OFFSET) { offs -= STM32_BSEC_OTP_OFFSET; shadow = false; } @@ -373,7 +402,9 @@ static int stm32mp_bsec_read(struct udevice *dev, int offset, for (i = otp; i < (otp + nb_otp) && i <= BSEC_OTP_MAX_VALUE; i++) { u32 *addr = &((u32 *)buf)[i - otp]; - if (shadow) + if (lock) + ret = stm32mp_bsec_read_lock(dev, addr, i); + else if (shadow) ret = stm32mp_bsec_read_shadow(dev, addr, i); else ret = stm32mp_bsec_read_otp(dev, addr, i); @@ -392,12 +423,15 @@ static int stm32mp_bsec_write(struct udevice *dev, int offset, { int ret = 0; int i; - bool shadow = true; + bool shadow = true, lock = false; int nb_otp = size / sizeof(u32); int otp; unsigned int offs = offset; - if (offs >= STM32_BSEC_OTP_OFFSET) { + if (offs >= STM32_BSEC_LOCK_OFFSET) { + offs -= STM32_BSEC_LOCK_OFFSET; + lock = true; + } else if (offs >= STM32_BSEC_OTP_OFFSET) { offs -= STM32_BSEC_OTP_OFFSET; shadow = false; } @@ -410,7 +444,9 @@ static int stm32mp_bsec_write(struct udevice *dev, int offset, for (i = otp; i < otp + nb_otp && i <= BSEC_OTP_MAX_VALUE; i++) { u32 *val = &((u32 *)buf)[i - otp]; - if (shadow) + if (lock) + ret = stm32mp_bsec_write_lock(dev, *val, i); + else if (shadow) ret = stm32mp_bsec_write_shadow(dev, *val, i); else ret = stm32mp_bsec_write_otp(dev, *val, i); diff --git a/arch/arm/mach-stm32mp/cpu.c b/arch/arm/mach-stm32mp/cpu.c index ea0bd94..5febed7 100644 --- a/arch/arm/mach-stm32mp/cpu.c +++ b/arch/arm/mach-stm32mp/cpu.c @@ -61,12 +61,6 @@ #define BOOTROM_INSTANCE_MASK GENMASK(31, 16) #define BOOTROM_INSTANCE_SHIFT 16 -/* BSEC OTP index */ -#define BSEC_OTP_RPN 1 -#define BSEC_OTP_SERIAL 13 -#define BSEC_OTP_PKG 16 -#define BSEC_OTP_MAC 57 - /* Device Part Number (RPN) = OTP_DATA1 lower 8 bits */ #define RPN_SHIFT 0 #define RPN_MASK GENMASK(7, 0) diff --git a/arch/arm/mach-stm32mp/include/mach/stm32.h b/arch/arm/mach-stm32mp/include/mach/stm32.h index f063600..6daf9f7 100644 --- a/arch/arm/mach-stm32mp/include/mach/stm32.h +++ b/arch/arm/mach-stm32mp/include/mach/stm32.h @@ -119,7 +119,14 @@ enum forced_boot_mode { #define STM32_BSEC_SHADOW(id) (STM32_BSEC_SHADOW_OFFSET + (id) * 4) #define STM32_BSEC_OTP_OFFSET 0x80000000 #define STM32_BSEC_OTP(id) (STM32_BSEC_OTP_OFFSET + (id) * 4) - +#define STM32_BSEC_LOCK_OFFSET 0xC0000000 +#define STM32_BSEC_LOCK(id) (STM32_BSEC_LOCK_OFFSET + (id) * 4) + +/* BSEC OTP index */ +#define BSEC_OTP_RPN 1 +#define BSEC_OTP_SERIAL 13 +#define BSEC_OTP_PKG 16 +#define BSEC_OTP_MAC 57 #define BSEC_OTP_BOARD 59 #endif /* __ASSEMBLY__*/ diff --git a/arch/arm/mach-stm32mp/include/mach/stm32mp1_smc.h b/arch/arm/mach-stm32mp/include/mach/stm32mp1_smc.h index 8130546..7b9167c 100644 --- a/arch/arm/mach-stm32mp/include/mach/stm32mp1_smc.h +++ b/arch/arm/mach-stm32mp/include/mach/stm32mp1_smc.h @@ -27,6 +27,7 @@ #define STM32_SMC_READ_OTP 0x04 #define STM32_SMC_READ_ALL 0x05 #define STM32_SMC_WRITE_ALL 0x06 +#define STM32_SMC_WRLOCK_OTP 0x07 /* SMC error codes */ #define STM32_SMC_OK 0x0 |